//02:ex2.8.2.5.cpp
#include <iostream>

int substract (int n1, int n2);
int main(void)
{
    int a, b, c;
    std::cout << "Enter tow integers:\n";
    std::cin >> a >> b;
    c = a - b;
    std::cout << " a - b = " << c << std::endl;

    return 0;
}

int substract (int n1, int n2)
{
    return n1 - n2;
}